<?php

/**
 * @author gbfun <gbfun@163.com>  2018-06-23 15:40
 * http://www.wuweiyou.com
 */

class db_table_background_member extends db_table_member
{    
    protected static $_instance;
    
    public static function get_instance()
    {
        if (null === self::$_instance) {
            self::$_instance = new self();    //by gbfun 又是静态变量
        }
    
        return self::$_instance;
    }
}

